THE DIAL-UP MODEM POOL

The table below shows the current makeup of the modem pool. When calling the modem pool, please follow the instructions below. A very complete technical description of the modem pool is provided in The High-Speed Modem-Pool Explained. If you are using SLIP/PPP service make sure you read or download the Dial-Up Network Service documentation.

Usage reports are available. Use these reports to plan around the times that the modem pool is in heavy use.

Pool Number	Type	No.	Speed	Protocols	Idle Timeout
212 854-9924 212 854-1896	USR	122	14.4kbps V.32bis	V.42 V.42bis	20 min
212 853-9903	USR	112	28.8kbps V.34	V.42 V.42bis	20 min
Express Pool - (Max session length: 25 minutes)
212 854-2477	USR	16	14.4kbps V.32bis	V.42 V.42bis	10 min
ROLM Modem Pool
212 854-1824 212 854-1824	Vadic	16	2400bps V.22bis	NONE

USR = US Robotics Modem

Instructions

A diagram of the phone numbers and forwarding sequences is available.
• Use 854-9924 if you have a V.32bis or lower modem. If all lines are busy, this pool hunts to the V.34 pool.
• Use 853-9903 if you have a V.34 modem. If all lines are busy, you'll get a busy signal. Dial this number only if you have a V.34 modem.
• Use 854-2477 to access the express modem pool. If all lines are busy, you'll get a busy signal. Note that NO WARNING is given at the 25 minute timeout.
• When dialing the low-speed Vadics, use 2400 bps and disable all error correction and compression features of your modem.
• When dialing the USRs, enable hardware flow control, V.42 or MNP4 error correction, and V.42bis or MNP5 compression if your modem has them.

Academic Information Systems 212 854.4854 consultant@columbia.edu
22May96